<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" show-icon :closable="false">
      </el-alert>
      <!-- 级联选择器行 -->
      <el-row class="cascader-top">
        <el-col>
          <span>选择商品分类: </span>
          <el-cascader expand-trigger="hover" :options="cateList" v-model="selectedCateKets" @change="handleChange"
            :props="cateProps">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- Tab 标签页区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
            @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{ item }}</el-tag>
                <!-- 添加标签区域 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New
                  Tag</el-button>

              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
            @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">{{ item }}</el-tag>
                <!-- 添加标签区域 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New
                  Tag</el-button>

              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form ref="addFormRef" :rules="addFormRules" :model="addForm" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 编辑参数的对话框 -->
      <el-form ref="editFormRef" :rules="editFormRules" :model="editForm" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>


export default {
  data() {
    return {
      // 获得所有商品分类的列表
      cateList: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框的双向绑定的数据
      selectedCateKets: [],
      // 被激活的页签名称
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入内容', trigger: 'blur' }
        ]

      },
      editDialogVisible: false,
      editForm: {
        attr_name: ''
      },
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入内容', trigger: 'blur' }
        ]
      },

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.cateList = res.data
    },
    handleChange() {
      this.getParamsList()
    },
    // Tab页签点击处理函数
    handleTabClick() {
      this.getParamsList()
    },
    async getParamsList() {
      if (this.selectedCateKets.length !== 3) {
        this.selectedCateKets = []
        this.manyTableData=[]
        this.onlyTableData=[]
        return
      }
      // 根据所选的Id,和所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })

      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        item.inputValue = ''

      })
      // console.log(res.data);

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      }
      this.onlyTableData = res.data
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        console.log(res.data);
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加用户成功')
        this.addDialogVisible = false
        this.getParamsList()
      })
    },
    // 点击按钮，显示修改参数的对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取表单失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.$message.success('修改参数成功')
        this.getParamsList()
        this.editDialogVisible = false
      })
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 根据Id 删除参数
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult === 'cancel') return this.$message.info('已取消该操作')
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败')
      this.$message.success('删除参数成功')
      this.getParamsList()
    },
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick当页面上的元素被重新渲染时，才会执行回调函数
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      
      this.saveAttrVals(row)
    },
    // 发起请求，保存操作
    async saveAttrVals(row){
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })
      if(res.meta.status!==200) return this.$message.error('修改参数项失败')
      this.$message.success('修改参数项成功')
    },
    // 删除对应的标签
    handleClosed(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKets.length !== 3) return true
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKets.length === 3) return this.selectedCateKets[2]
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') return '动态参数'
      return '静态属性'
    }
  }
}


</script>

<style lang="less" scoped>
.cascader-top {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>